wc

Word count, line, character, and byte count.

Syntax
wc [-clmw] [file ...]
Options
-c The number of bytes in each input file is written to the standard output.
-l The number of lines in each input file is written to the standard output.
-m The number of characters in each input file is written to the
standard output. If the current locale does not support multi-
byte characters, this is equivalent to the -c option.
-w The number of words in each input file is written to the standard output.

When an option is specified, wc only reports the information requested by
that option. The default action is equivalent to specifying the -c, -l and -w options.

If no files are specified, the standard input is used and no file name is
displayed.

The command grep -c will also count the number of matching lines, grep -c is faster than piping grep to wc -l

The wc utility displays the number of lines, words, and bytes contained
in each input file (or standard input, by default) to the standard output.

A
line is defined as a string of characters delimited by a
character, and a word is defined as a string of characters delimited
by white space characters. White space characters are the set of characters
for which the iswspace(3) function returns true.

If more than one input file
is specified, a line of cumulative counts for all the files is displayed on
a separate line after the output for the last file.

The LANG, LC_ALL and LC_CTYPE environment variables affect the
execution of wc as described in environ(7).

Exits 0 on success, and >0 if an error occurs.

Examples

Count the number of characters, words and lines in each of the files
report1 and report2 as well as the totals for both: